Since 1967, Holland Company has been a leading producer and supplier of Aluminum based products, such as Aluminum Sulfate, Polyaluminum Chloride, Sodium Aluminate, as well as Dry Alum, and our new product addition, Sodium Bisulfite. Our manufacturing facilities are strategically located to allow us to serve the Northeast with prompt delivery. Holland Company Specialty Dry Alums are shipped throughout North America and to export markets.